If you're good with SQL, I'd suggest starting with DB authentication and DB enrollments. This is assuming you don't need to tie into a larger system for user authentication and want to do moodle as a standalone system. Keep in mind user authentication and enrollments are 2 different, though related, functions and you can mix-and-match as needed. Unfortunately groups will need to be manually created unless you do some extra programming work.
--S
Enrolment
Enrolling New Students
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